19146

Appears in sequences

• a(n) = Sum_{k=1..n-1} gcd(k,n)*a(k), a(1) = 1.at n=13A072979
• a(n) = min{ m : sum_{n <= i <= m} 1/p_i > 1}, where p_i is the i-th prime = A000040(i).at n=22A092325
• Composite numbers, not ending with 0, sharing a 3-digit sequence with some of its prime factors.at n=16A131523
• Sum of prime anti-divisors of n = sum of prime anti-divisors of n+1 with n > 1.at n=6A192283
• Number of nX3 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X4 binary array having a sum of two or less, with rows and columns of the latter in lexicographically nondecreasing order.at n=7A227260
• T(n,k)=Number of nXk 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(k+1) binary array having a sum of two or less, with rows and columns of the latter in lexicographically nondecreasing order.at n=47A227263
• T(n,k)=Number of nXk 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(k+1) binary array having a sum of two or less, with rows and columns of the latter in lexicographically nondecreasing order.at n=52A227263
• Positive integers m such that pi(m^3) = pi(j^3) + pi(k^3) for some 0 < j <= k < m.at n=23A262409
• Growth series for affine Coxeter group B_5.at n=18A267168
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 181", based on the 5-celled von Neumann neighborhood.at n=29A270628
• Numbers k such that (101*10^k + 1)/3 is prime.at n=23A275978